From: SpringFlowers AutumnMoon <summercoolness@...>
Date: 2007-09-19T00:50:25+09:00
Subject: Re: CPU Usage not near 100% when running code

Robert Klemme wrote:
> 2007/9/18, SpringFlowers AutumnMoon <summercoolness@gmail.com>:

> Maybe your process is IO bound - probably without you being aware of
> it (e.g. through paging, network IO, IPC or such).

i can be just running calculations or just the following:

require 'benchmark'

n = 10_000_000
b = 123
c = 456

Benchmark.bm do |x|
  x.report { for i in 1..n; a = b + c; end }
  x.report { n.times do   ; a = b + c; end }
  x.report { 1.upto(n) do ; a = b + c; end }
end


If I run the same code on a Mac with single core, the CPU meter will go 
to 100%.  In the old days when I had a single Intel Windows XP machine, 
calculation intensive programs will make it go to 100% too.

if the Ruby VM uses only one core, then why won't one core go to 100%?

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